Tesla X Owner's Manual page 12

Doors
lock until after all the doors are closed and
you have walked away with the key.
10
Unlocking When the Key Doesn't
Work
If Model X does not unlock when you walk up
to it, or when you press the unlock button on
your key, the key's battery may be dead. If this
is the case, you can still unlock and drive
Model X.
To unlock Model X (and disable the security
alarm), first position the key at the base of the
door pillar between the front door and the
falcon wing door, on the driver's side of the
vehicle, as shown. Then press the front driver's
door handle. If Model X doesn't unlock, try
adjusting the position of the key. The key must
be in the correct position.
To drive Model X, place the key against the
center console, immediately below the 12V
power outlet, then press and hold the brake
pedal to turn Model X on.
Note: Unlocking Model X using this method
disables walk-away locking. You must
manually re-enable walk-away locking after
replacing the key's battery.
For instructions on how to replace the key's
battery, see Replacing the Key Battery
page 5.
on
Model X Owner's Manual